We're working with a MEP consultant that is using our dwgs+IFC. They experience that dwg from Archicad lately make panning and zooming in revit (and acad) slow and jerky. They have noticed this in several projects when the architect is using Archicad (revit-generated dwgs work much better). The MEP-guy thinks it has to to with text elements. However when they look at the text properties they look exactly the same as those the MEP is using.